JP5647112B2 - Stereoscopic 3D liquid crystal display module and stereoscopic 3D liquid crystal display device - Google Patents

Description

  3D / stereo is a rapidly developing technology. This technique can be implemented in various ways. Stereoscopic solutions include shutter glasses, polarized glasses, and others that require the user to wear additional equipment. Although there is growing interest in autostereoscopic solutions that do not require additional equipment, spatial multiplexing may result in a poor viewing experience, and several objectives have been made to provide high quality autostereoscopic displays. Technology has been developed.

  Some autostereoscopic solutions use a double-sided film with a continuous mechanism on both sides. However, this particular type of film may have several drawbacks. A thin land part (between the lens mechanism and the base material, or between the prism mechanism and the base material, or both) is incorporated into the thickness by the optical component, but the thickness of the sharp corner part and the land part is between the layers. Separation may occur. In addition, differences in the size and structure of features on double-sided films can exacerbate film distortion. From an optical point of view, a double-sided film with a continuous mechanism also has a wider field of view in the horizontal direction than the desired field of view.

The stereoscopic 3D liquid crystal display module of the present invention includes a liquid crystal display panel and a directional backlight arranged to supply light to the liquid crystal display panel. The double-sided prism film is provided between the liquid crystal display panel and the directional backlight. The double-sided prism film has a first surface having a plurality of cylindrical lenses adjacent to the liquid crystal display panel, and a second surface having a plurality of prisms adjacent to the directional backlight and facing away from the first surface. Including. A plurality of prisms are opaque portion component interposed between the bottom of the adjacent prism Accordingly separated from each other.

The stereoscopic 3D liquid crystal display device of the present invention includes a liquid crystal display panel and a directional backlight arranged to supply light to the liquid crystal display panel. The directional backlight has a first side, a second side facing away from the first side, a first surface extending between the first side and the second side, and an opposite side from the first surface. A light guide having a second surface facing. The first surface of the light guide substantially redirects light and the second surface substantially transmits light to the liquid crystal display panel. The directional backlight also includes a first light source provided along the first side surface of the light guide and a second light source disposed along the second side surface of the light guide. The synchronous driving element is electrically connected to the first light source and the second light source, and the synchronous driving element alternately turns on or off each of the first light source and the second light source to switch the first side surface and the second light source. Synchronize with the side. The apparatus also includes a double-sided prism film provided between the liquid crystal display panel and the directional backlight. The double-sided prism film has a first surface having a plurality of cylindrical lenses adjacent to the liquid crystal display panel, and a second surface having a plurality of prisms adjacent to the directional backlight and facing away from the first surface. Including. A plurality of prisms are opaque portion component interposed between the bottom of the adjacent prism Accordingly separated from each other.

A more complete understanding of the invention can be obtained by considering the following detailed description of various embodiments of the invention in conjunction with the accompanying drawings.
1 is a schematic side view of an exemplary display device. FIG. 1 is a schematic side view of an exemplary display device in operation. FIG. 1 is a schematic side view of an exemplary display device in operation. FIG. FIG. 3 is a diagram of tools used in a process for manufacturing 3D film. The figure which shows having coated black material on the tool. The figure which shows hardening the black material. The figure which shows forming an optical resin on a tool and forming a discontinuous prism. The figure which shows having hardened optical resin. The figure of the hardening resin removed from the tool in order to form a prism in an optical film. FIG. 6 is a diagram of a lens added to an optical film to form a 3D film having opaque portions between non-continuous prisms. Figure 3D is a 3D film with transmissive parts between non-continuous prisms.

  The drawings are not necessarily to scale. Similar numerals used in the figures indicate similar components. However, it will be understood that the use of numbers to refer to components in a given figure does not constrain components in another figure that are labeled with the same number.

  In the following description, certain specific embodiments are shown by way of example with reference to the accompanying drawings, which form a part hereof. It should be understood that other embodiments may be envisaged and practiced without departing from the scope or spirit of the invention. Accordingly, the following detailed description is not to be taken in a limiting sense.

  All scientific and technical terms used herein have meanings commonly used in the art unless otherwise specified. The definitions provided herein are intended to facilitate the understanding of some terms often used herein and are not intended to limit the scope of the present disclosure.

  Unless otherwise indicated, all numbers representing the size, amount, and physical characteristics of features used in the specification and claims are understood to be modified by the term “about” in each case. Should be. Therefore, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and the appended claims are not intended to be targeted by those skilled in the art using the teachings disclosed herein. It is an approximate value that can vary depending on the characteristics of

  The recitation of numerical ranges by endpoints includes all numbers subsumed within that range (eg 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, And all ranges within that range are included.

  As used in this specification and the appended claims, the singular forms “a” and “the” refer to plural referents unless the content clearly dictates otherwise. Embodiments having the same. As used herein and in the appended claims, the term “or” is generally employed in its sense including “and / or” unless the content clearly dictates otherwise.

  The term “for autostereoscopic display” refers to displaying a three-dimensional image that can be viewed without the use of special headgear or glasses on the part of the user or viewer. These methods create a sense of depth for the viewer, even if the image is generated by a flat device. The term stereoscopic 3D encompasses the field of autostereoscopic devices, but stereoscopic, which requires dedicated headgear, typically shutter glasses, to view stereoscopic 3D from flat devices. This includes the case of a 3D display.

  The present disclosure relates to a backlit liquid crystal display device, and more particularly to displaying a stereo 3D image using a liquid crystal display device having a 3D film with a discontinuous prism. Embodiments of the present invention may be incorporated into a single display capable of providing 3D visualization capabilities from a flat display in shutter glasses stereoscopic 3D display mode or in autostereoscopic display mode. While not limiting the invention, various aspects of the invention will be appreciated through consideration of the examples provided below.

3D display A liquid crystal display is a sample-and-hold display device, where an image at any particular point is updated within the next image refresh time, usually 1/60 seconds or faster. Until stable. In such a sample-and-hold system, during the sequential refresh of the display, to display different images, specifically alternating left and right images for a 3D display, for example, the left eye A careful sequence of backlight sources is required so that the light source does not turn on during the display of data for the right eye and vice versa.

  FIG. 1 is a schematic side view of an exemplary display device 10. The display device includes a liquid crystal display panel 20 and a directional backlight 30 arranged to supply light to the liquid crystal display panel 20. The directional backlight 30 may be modulated between a right eye image solid state light source 32 and a left eye image solid state light source 34 in a number of embodiments at a speed of at least 90 hertz. The solid-state light source 32 or the plurality of first light sources 32 and the solid-state light source 34 or the plurality of second light sources 34 for the left-eye image are provided. A double-sided prism film 40 is provided between the liquid crystal display panel 20 and the directional backlight 30.

  The liquid crystal display panel 20 and / or the directional backlight 30 can have any useful shape or outline. In many embodiments, the liquid crystal display panel 20 and the directional backlight 30 have a square or rectangular shape. However, in some embodiments, the liquid crystal display panel 20 and / or the directional backlight 30 has more than four sides or is curved. Although the present disclosure relates to 3D backlights for any autostereoscopic display, including those requiring shutter glasses or a plurality of light guides and associated liquid crystal display panels, the present disclosure relates to autostereoscopic displays. It is particularly useful.

  The synchronous drive element 50 is electrically connected to the directional backlight 30, the plurality of first light sources 32 and the second light sources 34, and the liquid crystal display panel 20. The synchronous drive element 50 is a solid-state light source 32 for the right-eye image and a solid-state light source 34 for the left-eye image so that image frames are supplied to the liquid crystal display panel 20 at a rate of 90 frames per second or more in many embodiments. Are synchronized to produce a flicker-free still image sequence, video stream, or rendered computer graphics. An image (eg, video or computer rendered graphics) source 60 is connected to the synchronous drive element 50 and supplies image frames (eg, right eye image and left eye image) to the liquid crystal display panel 20.

  The liquid crystal display panel 20 can be any useful transmissive liquid crystal display panel. In many embodiments, the liquid crystal display panel 20 has a frame response time of less than 16 milliseconds, or less than 10 milliseconds, or less than 5 milliseconds. Commercially available transmissive liquid crystal display panels having a frame response time of less than 10 milliseconds, or less than 5 milliseconds, or less than 3 milliseconds are, for example, Toshiba Matsushita Display (TMD) optically compensated bend (OCB) mode panels LTA090A220F ( Toshiba Matsushita Display Technology Co., Ltd., Japan).

  The directional backlight 30 has a solid state light source 32 for the right eye image and a solid state light source for the left eye image at a speed of at least 90 hertz, or 100 hertz, or 110 hertz, or 120 hertz, in many embodiments. 34 can be any useful directional backlight that can be modulated between.

  The illustrated directional backlight 30 includes a plurality of first light sources 32 or a first light incident surface 31 adjacent to the solid-state light source 32 of the right-eye image, and a plurality of second light sources 34 or a left-eye image. The second side portion 33 or the second light incident surface 33 facing the opposite side and adjacent to the solid-state light source 34 is included. The first surface 36 extends between the first side portion 31 and the second side portion 33, and the second surface 35 faces away from the first surface 36, and the first side portion 31 and the second side portion 33 It extends between the two side portions 33. The first surface 36 substantially redirects light (eg, reflection, extraction, etc.), and the second surface 35 substantially transmits light. In many embodiments, the highly reflective surface is in contact with or adjacent to the first surface 36 and serves to redirect light through the second surface 35.

  In many embodiments, the first surface 36 includes a plurality of extraction elements, such as a linear prism or lens mechanism as shown. In many embodiments, the linear prism or lens mechanism extends in a direction parallel to the first side portion 31 and the second side portion 33, or in a direction parallel to the linear prism and lens mechanism of the double-sided prism film 40. it can.

  The solid state light source may be any useful fixed light source that can be modulated, for example, at a rate of at least 90 hertz. In many embodiments, the semiconductor light source is a plurality of light emitting diodes, such as, for example, Nichia NSSW020B (Nichia Chemical Industries, Ltd., Japan). In other embodiments, the solid state light source is a plurality of laser diodes or organic light emitting diodes (ie, OLEDs). A solid state light source can emit any wavelength or range or combination of wavelengths of a number of visible rays, such as red, blue, and / or green, for example, to produce white light. A directional backlight is a single layer made of an optically transparent material having light sources at both ends, or an optically transparent material having a light source for each layer that preferentially extracts light in the desired direction for each layer. It can be two (or more) layers made of

  The double-sided prism film 40 can be any useful prism having a lens structure on the first surface and a prism structure on the opposite side. The double-sided prism film 40 transmits light at an appropriate angle from the directional backlight to the liquid crystal display panel 20 so that the viewer perceives the depth of the displayed image. Useful double-sided prism films are described in US Pat. Nos. 7,224,529 and 7,210,836, both of which are hereby incorporated by reference as if fully set forth. .

  The image source 60 can be any useful image source that can provide image frames (eg, right eye and left eye images), such as, for example, a video source or a computer rendered graphic source. In many embodiments, the video source can provide 50-60 hertz or more image frames. In many embodiments, a computer rendered graphics source can provide image frames of 100-120 hertz or higher.

  The computer rendered graphic source can provide game content, medical imaging content, computer aided design content, and the like. The computer rendered graphics source can be Nvidia FX5200 (Nvidia FX5200) graphics card, Nvidia GeForce 9750 GTX (Nvidia GeForce 9750 GTX) graphics card, or Nvidia Force GO 7900 GS for portable solutions such as laptops, for example. (Nvidia GeForce GO 7900 GS) may include a graphics processing unit, such as a graphics card. The computer rendered graphic source may also incorporate appropriate stereo driver software such as, for example, OpenGL, DirectX, or 3D stereo driver owned by Nvidia.

  A video source can provide video content. The video source may include a graphics processing unit such as, for example, an Nvidia Quadro FX1400 graphics card. The video source may also incorporate appropriate stereo driver software, such as 3D stereo drivers owned by OpenGL, DirectX, or NVIDIA.

  The synchronous drive element 50 is supplied to the liquid crystal display panel 20 to activate and deactivate (ie, modulate) the solid-state light source 32 for the right-eye image and the solid-state light source 34 for the left-eye image, for example, at a speed of 90 frames or more per second. Any useful drive element that generates flicker-free video or rendered computer graphics can be included in synchronization with the image frame. Synchronous drive element 50 is, for example, a Wester VP-7 (Westar VP-7) video adapter (Westar Display Technologies, Inc.), Missouri, coupled with custom solid state light source drive electronics. Video interfaces such as St. Charles, Missouri) can be included.

  2A and 2B are schematic side views of the exemplary display device 10 in operation. In FIG. 2A, the solid-state light source 34 (that is, a plurality of second light sources 34) for the left-eye image is turned on, and the solid-state light source 32 (ie, the plurality of first light sources 32) for the right-eye image is not turned on. In this state, the light emitted from the solid-state light source 34 of the image for the left eye is transmitted through the directional backlight 30, and is transmitted through the double-sided prism film sheet 40 and the liquid crystal panel 20 to the viewer's or viewer's left eye 1a. Supply a directed left eye image. In FIG. 2B, the right-eye image solid-state light source 32 is lit, and the left-eye image solid-state light source 34 is not lit. In this state, the light emitted from the solid-state light source 32 for the right eye passes through the directional backlight 30, passes through the double-sided prism sheet 40 and the liquid crystal panel 20, and is directed to the viewer's or viewer's right eye 1b. Supply right eye image. The right eye solid light source 32 is located on the right side of the light guide and the left eye image solid light source 34 is located on the left side of the light guide, but in some embodiments, the right eye solid light source 32 is on the left side of the light guide. It will be appreciated that the left eye image solid state light source 34 is positioned on the right side of the light guide.

  The light sources 32, 34 can be air coupled or refractive index matched to the light guide of the backlight. For example, packaged light source devices (e.g., LEDs) can be edge coupled without the use of index matching material in the light guide. Alternatively, packaged or bare die LEDs can be index-matched and / or encapsulated within the edge of the light guide to increase efficiency. This feature may include additional optical features (eg, an injection wedge shape) on the end of the light guide to efficiently carry incident light. Alternatively, the LEDs may be embedded in the light guide edges or sides 31, 33 with appropriate properties in order to efficiently collect and collimate the LED light into the light guide's total internal reflection (TIR) mode. it can.

  The liquid crystal display panel 20 has a variable refresh rate or image update rate, but for this example application, a refresh rate of 60 Hertz is assumed. This means that a new image is shown to the viewer every 1/60 seconds, ie every 16.67 milliseconds (msec). In a 3D system, this means that the right image of frame 1 is shown at time t = 0 (zero). At time t = 16.67 milliseconds, the left image of frame 1 is shown. At time t = 2 × 16.67 milliseconds, the right image of frame 2 is shown. At time t = 3 × 16.67 milliseconds, the left image of frame 2 is shown and the process is thus repeated. The effective frame rate is half that of a normal imaging system. This is because, in each image, a left eye view and a right eye view of the image are shown.

  In this example, the plurality of first light sources are turned on at time t = 0 to illuminate the right (or left) image, thereby supplying light to the right (or left) image, respectively. At time t = 16.67 milliseconds, start placing the second image (left or right) in place. This image replaces the “image at time t = 0” from the top of the LCD panel to the bottom of the LCD, which in this example takes 16.67 milliseconds to complete. In a solution that does not scan, the brightness of the display is usually low because the second plurality of light sources are all turned on after the first plurality of light sources are turned off during this transition. This means that if the continuous left and right images should not be illuminated with an inappropriate light source that causes 3D crosstalk and a poor 3D viewing experience, the image data is stable or moderate throughout the image. This is because it must be stable.

  By providing the viewer with at least 45 left eye images and at least 45 right eye images per second (alternating right eye image and left eye image, and the image is a repeat of the previous image pair Provide a viewer with a flicker-free 3D image. Thus, when different right-viewpoint and left-viewpoint image pairs are displayed, either by a computer-rendered image or an image acquired from a still or video image camera, it is displayed in synchronization with the switching of the light sources 32 and 34 If so, the viewer can visually fuse two different images, creating a perception of depth from a flat panel display. The limitation of this visually flickerless operation is that, as mentioned above, the backlight should not be turned on until the new image displayed on the liquid crystal display panel has stabilized, otherwise crosstalk and image quality Bad stereoscopic images are perceived.

  The directional backlight 30 and associated light sources 32, 34 described herein may be very thin (thickness or diameter), for example, less than 5 millimeters, or 0.25-5 millimeters, or 0. It may be 5-4 millimeters, or 0.5-2 millimeters.

3D Film Embodiments of the present invention help to reduce the above-identified drawbacks of certain types of double-sided films having continuous prisms. Since the apex of the prism is an important element for defining a good autostereoscopic optical effect, embodiments of the present invention provide a flat portion between the bottoms of the prism, i.e., an air gap, which causes the prism to be discontinuous. To do. This mechanism can be adjusted to increase the thickness of the land part and reduce the sharpness of the mechanism near the film substrate, specifically, the transition part between the prism and the land part is not acute, Curvature improves the mechanical stability of the film, prevents cracks and delamination, and reduces film distortion. Additional embodiments include placing a black or opaque (light absorption) mechanism in the structure between the discontinuous prisms, which can reduce off-axis rays.

  3A-3B and FIG. 4 show the manufacturing process of a double-sided 3D prism film with discontinuous prisms. FIG. 3A is a diagram of a portion of a tool used in a process for producing 3D film. The tool includes a series of non-continuous truncated prisms 41. Although only one prism is shown for purposes of illustration, this tool has the necessary or desired number of non-continuous prism features to produce a 3D film. The truncated portion of the prism 41 may form a recess 42 or flat, or the process used to cut the prism leaves the original tool surface between the prisms (typically flat). Also good. The tool can be made, for example, using the universal diamond turning method described in WO 00/48037 (incorporated herein by reference as if fully set forth).

  FIG. 3B is a diagram showing that the tool 41 is coated with an opaque material (a kind of secondary material). The opaque material 43 is applied to the truncated portion 42 of each prism 41 by a kiss coating process. Examples of opaque materials used in 3D films include black pigmented curable binders, preferably containing carbon black as a pigment and a photocurable acrylate as a binder, black or any absorbing color of the desired wavelength Ink-containing ink, pigmented resin, and UV curable acrylate with carbon black added. For opaque materials, it may be desirable for the refractive index of the binder to match the refractive index of the deposited layer in order to minimize interface reflections. In other embodiments, it may be desirable for the refractive index of the binder to be different from the refractive index of the deposited layer to achieve other desired optical effects.

  The coated opaque material 43 is then cured as illustrated in FIG. 3C. FIG. 3D is a diagram illustrating coating a tool with an optical resin. After the opaque material 43 is cured, the optical resin material 44 is coated on the tool and covers the prism 41. The optical resin is cured after coating and then removed from the tool 41 as illustrated in FIG.

  FIG. 5 is a view of the cured optical resin removed from the tool to form one side of an optical film having non-continuous prisms 44 separated by opaque material. To form a complete double-sided prism film, a cylindrical lens 45 is added to the surface facing away from the optical film as shown in FIG. The lens can be added and cured using another tool having a cylindrical groove coated on the side facing away from the optical film and removed from the other tool. 3D film lenses and prisms can be manufactured using a microreplication process such as, for example, continuous casting and curing (3C). Examples of the 3C process are described in U.S. Pat. Nos. 4,374,077, 4,576,850, 5,175,030, 5,271,968, 5,558, 740 and 5,995,690, all of which are hereby incorporated by reference as if fully set forth. The lenses face the opposite as described in US Pat. Nos. 7,165,959 and 7,224,529, both of which are hereby incorporated by reference as if fully set forth. Using a method for producing an optical film having an alignment pattern that is microreplicated on the surface, it can be aligned to a prism of a 3D film. The liquid from which the microreplicated structure is made is typically a photopolymerizable curable material such as an acrylate that is cured by ultraviolet light. Other coating materials, such as polymerizable materials, can be used and the choice of material may vary depending on the desired properties of the microreplicated structure. Examples of curing methods used in this process include reaction curing, heat curing, or radiation curing. As noted above, the secondary material between the prisms can be opaque, but useful optical effects can be achieved by using materials with other useful properties such as different refractive index, birefringence, mechanical elasticity, etc. Can be obtained by adding to

  The secondary material need not be applied to the tool that forms the microreplication mechanism, as described above. For example, the material can be filled into an evaporative carrier, the carrier and material can be coated on the desired side of the double-sided film, and the carrier can be evaporated. This method leaves a residue of filler material and can form a deposit of secondary material as shown in FIGS.

  FIG. 6 is an illustration of a lens added to an optical film to form a double-sided prism film with opaque portions between non-continuous prisms. As shown in FIG. 6, the 3D film is separated by a substrate portion 46, a series of lenses 45 on one side of the substrate 46, and an opaque portion 43 on the opposite side of the substrate 46. A series of non-continuous prisms 44 are included. The lens-side land portion 55 and the lenticular-side land portion 56 can be adjusted according to mechanical and optical requirements, respectively.

  The pitch of the lenses and prisms can be adjusted based on the specific implementation environment. The term “pitch” for a lens refers to the distance between the centers of adjacent lenses, as illustrated by distances 51 and 52. The term “pitch” for a prism refers to the distance between the centers of adjacent prisms, as illustrated by distances 53 and 54.

  An alternative embodiment includes a 3D film with a transmissive portion between the discontinuous films. As shown in FIG. 7, the double-sided prism film of this alternative embodiment has a substrate portion 46, a series of lenses 45 on one side of the substrate 46, and a transparency on the opposite side of the substrate 46. It includes a series of non-continuous prisms 44 separated by a portion 47. This film can be manufactured in the same manner as the film shown in FIG. 6 except that the steps shown in FIGS. 3B and 3C can be omitted so that the prism is separated by the cured optical resin portion without using an opaque material. . Further, the tool for forming the prism can include a substantially flat top instead of the recess 42 to form a substantially flat transmissive portion between the discontinuous prisms 44. In the film shown in FIG. 7, the lens-side land portion 55 and the lenticular-side land portion 56 can be adjusted according to mechanical and optical requirements, respectively. In FIGS. 6 and 7, the lenses are shown continuously, but as an alternative, the lenses can be discontinuous.

  In the 3D film of FIGS. 6 and 7, the lenses and prisms can have either a constant pitch or a different pitch. The term “constant pitch” means that, for example, the distances 51 and 52 are substantially equal to the distances 53 and 54 and may be acceptable based on the manufacturing process, so that the lens pitch is the same as the prism pitch. It means that it is designed to be within the limits. The term “different pitch” means that the distances 51 and 52 are designed such that the distances 51 and 52 are not equal to the distances 53 and 54, for example, so that the lens pitch is different from the prism pitch. Further, based on the pitch, it is possible to design the alignment between the lens and the prism so that the center of the prism is aligned with the center of the lens or the center of the prism is shifted from the center of the lens. Either type of alignment can be achieved by the process of manufacturing a film having a finely replicated alignment pattern in the above patent.

  The preferred dimensions of the lens and prism pitch are typically determined by selecting a pitch that results in the removal or reduction of moire patterns, for example in LCD panels incorporating 3D film. The pitch can also be determined based on manufacturability. Exemplary pitch dimensions for 3D films include 26 micrometers, 29 micrometers, 29.5 micrometers, 70.5 micrometers, and 52 micrometers. Since LCD panels are manufactured with different pixel pitches, it may be desirable to change the pitch of the 3D film to fit different pixel pitches. An example of a useful pitch range for 3D film is from 10 micrometers to 80 micrometers.

Claims (2)

A liquid crystal display panel;
A directional backlight arranged to supply light to the liquid crystal display panel;
A double-sided prism film provided between the liquid crystal display panel and the directional backlight;
The double-sided prism film has a first surface having a plurality of cylindrical lenses adjacent to the liquid crystal display panel, and a plurality of prisms adjacent to the directional backlight, and is opposite to the first surface. and a second surface facing said plurality of prisms, the opaque portion component interposed between the bottom of adjacent said prisms Thus are separated from each other,
Stereoscopic 3D LCD module. A liquid crystal display panel;
A directional backlight arranged to supply light to the liquid crystal display panel, the directional backlight comprising:
A first side, a second side facing away from the first side, a first surface extending between the first side and the second side, and a second side facing away from the first surface A light guide having two surfaces, wherein the first surface substantially redirects light and the second surface substantially transmits light to the liquid crystal display panel;
A first light source provided along the first side surface of the light guide;
A directional backlight including a second light source provided along the second side surface of the light guide;
A synchronous drive element electrically connected to the first light source and the second light source, each of the first light source and the second light source being alternately switched on or off, and the first side surface and the second light source; A synchronous drive element for synchronizing the second side surface;
A double-sided prism film provided between the liquid crystal display panel and the directional backlight;
The double-sided prism film has a first surface having a plurality of cylindrical lenses adjacent to the liquid crystal display panel, and a plurality of prisms adjacent to the directional backlight, and is opposite to the first surface. and a second surface facing said plurality of prisms, the opaque portion component interposed between the bottom of adjacent said prisms Thus are separated from each other,
Stereoscopic 3D liquid crystal display device.

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